Mark Johnston
79e0b69ce8
Empty mchains cannot be copied with simple assignment.
I think this bug is mostly harmless: if mcnext is empty, then it won't
be accessed again before it is reinitialized in the next loop iteration.
So the bug only trips an assertion in INVARIANTS kernels and won't be
visible otherwise.
Add a regression test which triggers this corner case.
Reported by: Jan Bramkamp
Fixes: d157927807 ("unix: new implementation of unix/stream & unix/seqpacket")
Reviewed by: glebius
MFC after: 1 week
Sponsored by: The FreeBSD Foundation
Differential Revision: https://reviews.freebsd.org/D58791
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